Sixty-three-year-old Los Angeles stoner, Hank Wallace, is just trying to get by and get high when he takes a gig distributing ads for a local company. But the job quickly turns into more than it seems. Hank begins hearing voices and experiencing strange visions while passing out the ads. Before he knows it, he's fallen prey to his employer, a demon from another world.
Possessed by the demon, Hank absorbs nightmares from others living in his corner of LA. He becomes a conduit that feeds anxiety and dread to the demon. The nightmares pour in, but they aren't enough. The demon requires more sustenance than the nightmares provide.
And the demon is in luck. Hank learns that his estranged sister, Carla, his only living relative, is terminally ill with cancer. He has steered clear of close relationships with family for decades, but he cannot avoid it any longer. The demon insists. Carla and her family's grief is a siren's call.
Hank drives to Sacramento bearing an invisible gift. The demon can erase their grief, but at what cost? Unless Hank can get his head together and snap out of it, the demon will consume every last one of them.